Horje
The Easy Theme Switcher plugin allows you to show different versions of your site in a very easy way.

Noted That:

  • To install correctly this easy-theme-switcher.zip.
  • Fisrt Download the easy-theme-switcher.zip to your computer
  • Extract/Open easy-theme-switcher.zip to Your Computer.
  • Then, Find readme.txt file inside easy-theme-switcher.zip and Open readme.txt.
  • Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
  • Then, Follow the Tips Below.

Start the Tips:

1. First Download "easy-theme-switcher.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

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3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

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4. Now, Click on "Upload Plugin" button.

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5. Now, Browse "easy-theme-switcher.zip" Downloaded plugin from your computer, Where you downloaded easy-theme-switcher.zip According to Step – 1 Above then, click on "Install Now"

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6. Now, Click on "Active Plugin"

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7. Then, See left sidemenu. "Easy Theme Switcher" folder is added on left sidemenu. Now, Click on "Easy Theme Switcher" folder.

   Noted that: If you do not see "Easy Theme Switcher" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Easy Theme Switcher Configurtions and Settings or How to work "Easy Theme Switcher" in your WordPress site.

 

oR

After Activated Plugin According to Step-6 then,

  1. Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
  2. or Direct go to: https://yourdomain/wp-admin/plugins.php
  3. Then, Find "Easy Theme Switcher" Activated Plugin from Plugin List.
  4. Then, Click on "Settings" from Plugin that is Easy Theme Switcher
  5. Now, Edit/Add/Config the setting and Click on "Save Changes" button,
WP Plugin Setting


Guide

Extract the zip file and just drop the contents in the wp-content/plugins/ directory of your WordPress installation and then activate the Plugin from Plugins page.

Usage

You can just enter the url in this way:
http://yoursite.com/?theme=yourtheme

Or use the function esw_set_theme in this way:

A Session will be created, so you don’t need to use this function on every page refresh or pass the GET parameter.

Reffered: https://wordpress.org/